found: Wikipedia, Dec. 16, 2013(Denis Sassou Nguesso (b. 23 November 1943, in Edou, Oyo district), Congolese politician who has been the President of Congo Brazzaville, since 1997; he was previously President, from 1979 to 1992, and headed the single-party regime of the Congolese Labour Party (PCT) for 12 years; under pressure, he introduced multiparty politics in 1990 and was then stripped of executive powers by the 1991 National Conference, remaining in office as a ceremonial head of state; candidate in the 1992 presidential election but was defeated) {http://en.wikipedia.org/wiki/Denis_Sassou_Nguesso}